1. Department of Community Health and Primary Care, College of Medicine, University of Lagos, Lagos, Nigeria.
2. Department of Epidemiology & Biostatistics, University of Birmingham, Birmingham, United Kingdom.
3. Health Services Management Centre, School of Social Policy, University of Birmingham, Birmingham, United Kingdom.
4. Department of Clinical Services, Nigerian Institute of Medical Research, Lagos, Nigeria.
5. Department of Medicine, University of Jos, Plateau State, Nigeria.
6. Department of Internal Medicine, Capital Health Regional Medical Center, Trenton, New Jersey.